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    Wyświetlanie 1-7 z 7
    Tytuł:
    Sensitivity of transient temperature field in domain of forearm insulated by protective clothing with respect to perturbations of external boundary heat flux
    Autorzy:
    Mochnacki, B.
    Ciesielski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201448.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bioheat transfer
    sensitivity analysis
    numerical modeling
    control volume method
    Voronoi diagram
    analiza wrażliwości
    modelowanie numeryczne
    metoda regulacji głośności
    diagram Voronoi
    Opis:
    The problem discussed in the paper is numerical modeling of thermal processes in the domain of biological tissue secured by a layer of protective clothing being in thermal contact with the environment. The cross-section of the forearm (2D problem) is treated as non-homogeneous domain in which the sub-domains of skin tissue, fat, muscle and bone are distinguished. The air gap between skin tissue and protective clothing is taken into account. The process of external heating is determined by Robin boundary condition and sensitivity analysis with respect to the perturbations of heat transfer coefficient and ambient temperature is also discussed. Both the basic boundary-initial problem and the sensitivity problems are solved by means of control volume method using Voronoi polygons.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 3; 591-598
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-loop control system design
    Autorzy:
    Alekseev, A.
    Zamyatin, S.
    Rudnicki, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/201635.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    control system
    multi-loop system
    plant identification
    auto tuning controller
    real interpolation method
    Opis:
    The approach based on a special case of the Laplace transform, which allows to design multi-loop system is considered. The tuning regulators program on the base of this approach is developed. The numerical example is shown.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 627-630
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Predictive and look-up table control methods of a three-level AC-DC converter under distorted grid voltage
    Autorzy:
    Falkowski, P.
    Kulikowski, K.
    Grodzki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/201956.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    three-level AC/DC converter
    direct power control
    finite contol set model predictive control
    lookup table method
    AC/DC
    trzypoziomowy konwerter AC/DC
    Opis:
    Power electronic three-level AC-DC converters connecting a utility grid with DC supplies are widely used in renewable energy sources. For such distributed systems, the quality of energy is very important. Hence, control algorithms of an AC-DC converter have to provide not only a sinusoidal shape of grid current, but also stable operation during transient states in the grid, e.g. voltage dips or voltage unbalance. This paper deals with the problem of robustness of AC-DC control methods under disturbed grid voltage. Three modern predictive control algorithms are presented and investigated under grid voltage distortions. Experimental results from a laboratory test setup illustrating properties of the described methods are shown.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 609-618
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infinite time horizon optimal current control of a stepper motor exploiting a finite element model
    Autorzy:
    Bernat, J.
    Stępień, S.
    Stranz, A.
    Szymański, G.
    Sykulski, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200378.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimal control theory
    linear quadratic problem
    finite element method
    teoria sterowania optymalnego
    liniowo-kwadratowy problem
    metoda elementów skończonych
    Opis:
    An optimal control theory based method is presented aiming at minimizing the energy delivered from source and the power loss in a stepper motor circuit. A linear quadratic current regulator with an infinite time horizon is employed and its appropriateness for this type of a problem explained. With the purpose of improving the accuracy of the control system, the self and mutual inductances of windings are calculated using a finite element model. The numerically computed results are verified experimentally.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 835-841
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Embedded control system development for the solution of self-adjusted regulator design problem and its robustness properties estimation
    Autorzy:
    Zamyatin, S. V.
    Kurgankin, V. V.
    Rudnicki, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/199963.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    automatic control system
    embedded system
    regulator design
    dynamic compensation principle
    robustness
    real interpolation method
    discrete real Laplace transformation
    Opis:
    The possibility of the embedded automatic-control system construction for a self-adjusted regulator design on the basis of dynamic compensation principle is observed. The description of mathematical and algorithmic apparatus of Control Object identification in a digital form resulted in a design of the regulator. Results of natural experiments are given. An analysis of the regulator robustness properties is carried out.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 341-347
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NFTSM control of direct yaw moment for autonomous electric vehicles with consideration of tire nonlinear mechanical properties
    Autorzy:
    Sun, Xiaoqiang
    Wang, Yujun
    Cai, Yingfeng
    Wong, Pak Kin
    Chen, Long
    Powiązania:
    https://bibliotekanauki.pl/articles/2173619.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    autonomous electric vehicles
    direct yaw moment control
    DYC
    tire nonlinear mechanical properties
    nonsingular fast terminal sliding mode
    NFTSM
    trust-region interior-point method
    pojazd elektryczny autonomiczny
    kontrola momentu odchylenia bezpośrednia
    właściwości mechaniczne opon nieliniowe
    niesingularny tryb szybkiego przesuwania terminala
    metoda punktu wewnętrznego regionu zaufania
    Opis:
    To improve the curve driving stability and safety under critical maneuvers for four-wheel-independent drive autonomous electric vehicles, a three-stage direct yaw moment control (DYC) strategy design procedure is proposed in this work. The first stage conducts the modeling of the tire nonlinear mechanical properties, i.e. the coupling relationship between the tire longitudinal force and the tire lateral force, which is crucial for the DYC strategy design, in the STI (Systems Technologies Inc.) form based on experimental data. On this basis, a 7-DOF vehicle dynamics model is established and the direct yaw moment calculation problem of the four-wheel-independent drive autonomous electric vehicle is solved through the nonsingular fast terminal sliding mode (NFTSM) control method, thus the optimal direct yaw moment can be obtained. To achieve this direct yaw moment, an optimal allocation problem of the tire forces is further solved by using the trust-region interior-point method, which can effectively guarantee the solving efficiency of complex optimization problem like the tire driving and braking forces allocation of four wheels in this work. Finally, the effectiveness of the DYC strategy proposed for the autonomous electric vehicles is verified through the CarSim-Simulink co-simulation results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e137065
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NFTSM control of direct yaw moment for autonomous electric vehicles with consideration of tire nonlinear mechanical properties
    Autorzy:
    Sun, Xiaoqiang
    Wang, Yujun
    Cai, Yingfeng
    Wong, Pak Kin
    Chen, Long
    Powiązania:
    https://bibliotekanauki.pl/articles/2128162.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    autonomous electric vehicles
    direct yaw moment control
    DYC
    tire nonlinear mechanical properties
    nonsingular fast terminal sliding mode
    NFTSM
    trust-region interior-point method
    pojazd elektryczny autonomiczny
    kontrola momentu odchylenia bezpośrednia
    właściwości mechaniczne opon nieliniowe
    niesingularny tryb szybkiego przesuwania terminala
    metoda punktu wewnętrznego regionu zaufania
    Opis:
    To improve the curve driving stability and safety under critical maneuvers for four-wheel-independent drive autonomous electric vehicles, a three-stage direct yaw moment control (DYC) strategy design procedure is proposed in this work. The first stage conducts the modeling of the tire nonlinear mechanical properties, i.e. the coupling relationship between the tire longitudinal force and the tire lateral force, which is crucial for the DYC strategy design, in the STI (Systems Technologies Inc.) form based on experimental data. On this basis, a 7-DOF vehicle dynamics model is established and the direct yaw moment calculation problem of the four-wheel-independent drive autonomous electric vehicle is solved through the nonsingular fast terminal sliding mode (NFTSM) control method, thus the optimal direct yaw moment can be obtained. To achieve this direct yaw moment, an optimal allocation problem of the tire forces is further solved by using the trust-region interior-point method, which can effectively guarantee the solving efficiency of complex optimization problem like the tire driving and braking forces allocation of four wheels in this work. Finally, the effectiveness of the DYC strategy proposed for the autonomous electric vehicles is verified through the CarSim-Simulink co-simulation results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137065, 1--13
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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